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rt-thread-official/bsp/stm32f411-nucleo/drivers/drv_usart.c

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/*
* File : drv_usart.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2015, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2009-01-05 Bernard the first version
* 2015-08-01 xiaonong the first version for stm32f7xx
* 2016-01-15 ArdaFu the first version for stm32f4xx with STM32 HAL
*/
#include "drv_usart.h"
#include "board.h"
#include <rtdevice.h>
#include <rthw.h>
#include <rtthread.h>
/* Exported types ------------------------------------------------------------*/
/* Exported constants --------------------------------------------------------*/
/* User can use this section to tailor USARTx/UARTx instance used and associated
resources */
/* Definition for USARTx clock resources */
#define USARTx USART2
#define USARTx_CLK_ENABLE() __HAL_RCC_USART2_CLK_ENABLE();
#define USARTx_RX_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
#define USARTx_TX_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
#define USARTx_FORCE_RESET() __HAL_RCC_USART2_FORCE_RESET()
#define USARTx_RELEASE_RESET() __HAL_RCC_USART2_RELEASE_RESET()
/* Definition for USARTx Pins */
#define USARTx_TX_PIN GPIO_PIN_2
#define USARTx_TX_GPIO_PORT GPIOA
#define USARTx_TX_AF GPIO_AF7_USART2
#define USARTx_RX_PIN GPIO_PIN_3
#define USARTx_RX_GPIO_PORT GPIOA
#define USARTx_RX_AF GPIO_AF7_USART2
/* STM32 uart driver */
struct drv_uart
{
UART_HandleTypeDef UartHandle;
IRQn_Type irq;
};
static rt_err_t drv_configure(struct rt_serial_device *serial,
struct serial_configure *cfg)
{
struct drv_uart *uart;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
uart = (struct drv_uart *)serial->parent.user_data;
uart->UartHandle.Init.BaudRate = cfg->baud_rate;
uart->UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
uart->UartHandle.Init.Mode = UART_MODE_TX_RX;
uart->UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
switch (cfg->data_bits)
{
case DATA_BITS_8:
uart->UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
break;
case DATA_BITS_9:
uart->UartHandle.Init.WordLength = UART_WORDLENGTH_9B;
break;
default:
uart->UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
break;
}
switch (cfg->stop_bits)
{
case STOP_BITS_1:
uart->UartHandle.Init.StopBits = UART_STOPBITS_1;
break;
case STOP_BITS_2:
uart->UartHandle.Init.StopBits = UART_STOPBITS_2;
break;
default:
uart->UartHandle.Init.StopBits = UART_STOPBITS_1;
break;
}
switch (cfg->parity)
{
case PARITY_NONE:
uart->UartHandle.Init.Parity = UART_PARITY_NONE;
break;
case PARITY_ODD:
uart->UartHandle.Init.Parity = UART_PARITY_ODD;
break;
case PARITY_EVEN:
uart->UartHandle.Init.Parity = UART_PARITY_EVEN;
break;
default:
uart->UartHandle.Init.Parity = UART_PARITY_NONE;
break;
}
if (HAL_UART_Init(&uart->UartHandle) != HAL_OK)
{
return RT_ERROR;
}
return RT_EOK;
}
static rt_err_t drv_control(struct rt_serial_device *serial,
int cmd, void *arg)
{
struct drv_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct drv_uart *)serial->parent.user_data;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
NVIC_DisableIRQ(uart->irq);
/* disable interrupt */
__HAL_UART_DISABLE_IT(&uart->UartHandle, UART_IT_RXNE);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
NVIC_EnableIRQ(uart->irq);
/* enable interrupt */
__HAL_UART_ENABLE_IT(&uart->UartHandle, UART_IT_RXNE);
break;
}
return RT_EOK;
}
static int drv_putc(struct rt_serial_device *serial, char c)
{
struct drv_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct drv_uart *)serial->parent.user_data;
__HAL_UART_CLEAR_FLAG(&(uart->UartHandle), UART_FLAG_TC);
uart->UartHandle.Instance->DR = c;
while (__HAL_UART_GET_FLAG(&(uart->UartHandle), UART_FLAG_TC) == RESET);
return 1;
}
static int drv_getc(struct rt_serial_device *serial)
{
int ch;
struct drv_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct drv_uart *)serial->parent.user_data;
ch = -1;
if (__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_RXNE) != RESET)
ch = uart->UartHandle.Instance->DR & 0xff;
return ch;
}
static const struct rt_uart_ops drv_uart_ops =
{
drv_configure,
drv_control,
drv_putc,
drv_getc,
};
#if defined(RT_USING_UART2)
/* UART1 device driver structure */
static struct drv_uart uart2;
struct rt_serial_device serial2;
void USART2_IRQHandler(void)
{
struct drv_uart *uart;
uart = &uart2;
/* enter interrupt */
rt_interrupt_enter();
/* UART in mode Receiver -------------------------------------------------*/
if ((__HAL_UART_GET_FLAG(&uart->UartHandle, UART_FLAG_RXNE) != RESET) &&
(__HAL_UART_GET_IT_SOURCE(&uart->UartHandle, UART_IT_RXNE) != RESET))
{
rt_hw_serial_isr(&serial2, RT_SERIAL_EVENT_RX_IND);
/* Clear RXNE interrupt flag */
__HAL_UART_CLEAR_FLAG(&uart->UartHandle, UART_FLAG_RXNE);
}
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* RT_USING_UART1 */
/**
* @brief UART MSP Initialization
* This function configures the hardware resources used in this example:
* - Peripheral's clock enable
* - Peripheral's GPIO Configuration
* - NVIC configuration for UART interrupt request enable
* @param huart: UART handle pointer
* @retval None
*/
void HAL_UART_MspInit(UART_HandleTypeDef *huart)
{
GPIO_InitTypeDef GPIO_InitStruct;
if (huart->Instance == USART2)
{
/*##-1- Enable peripherals and GPIO Clocks #################################*/
/* Enable GPIO TX/RX clock */
USARTx_TX_GPIO_CLK_ENABLE();
USARTx_RX_GPIO_CLK_ENABLE();
/* Enable USARTx clock */
USARTx_CLK_ENABLE();
/*##-2- Configure peripheral GPIO ##########################################*/
/* UART TX GPIO pin configuration */
GPIO_InitStruct.Pin = USARTx_TX_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
GPIO_InitStruct.Alternate = USARTx_TX_AF;
HAL_GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStruct);
/* UART RX GPIO pin configuration */
GPIO_InitStruct.Pin = USARTx_RX_PIN;
GPIO_InitStruct.Alternate = USARTx_RX_AF;
HAL_GPIO_Init(USARTx_RX_GPIO_PORT, &GPIO_InitStruct);
HAL_NVIC_SetPriority(USART2_IRQn, 0, 1);
HAL_NVIC_EnableIRQ(USART2_IRQn);
}
}
/**
* @brief UART MSP De-Initialization
* This function frees the hardware resources used in this example:
* - Disable the Peripheral's clock
* - Revert GPIO and NVIC configuration to their default state
* @param huart: UART handle pointer
* @retval None
*/
void HAL_UART_MspDeInit(UART_HandleTypeDef *huart)
{
if (huart->Instance == USART2)
{
/*##-1- Reset peripherals ##################################################*/
USARTx_FORCE_RESET();
USARTx_RELEASE_RESET();
/*##-2- Disable peripherals and GPIO Clocks #################################*/
/* Configure UART Tx as alternate function */
HAL_GPIO_DeInit(USARTx_TX_GPIO_PORT, USARTx_TX_PIN);
/* Configure UART Rx as alternate function */
HAL_GPIO_DeInit(USARTx_RX_GPIO_PORT, USARTx_RX_PIN);
HAL_NVIC_DisableIRQ(USART2_IRQn);
}
}
int hw_usart_init(void)
{
struct drv_uart *uart;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
#ifdef RT_USING_UART2
uart = &uart2;
uart->UartHandle.Instance = USART2;
serial2.ops = &drv_uart_ops;
serial2.config = config;
/* register UART1 device */
rt_hw_serial_register(&serial2, "uart2",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
uart);
#endif /* RT_USING_UART1 */
return 0;
}
INIT_BOARD_EXPORT(hw_usart_init);
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